In December 1945, five military planes were on a training flight after they ____ from a location in Florida in the US. The planes ____ for about an hour and they ____ about 300 miles when some of their equipment, which ____ perfectly up to that point, suddenly stopped working. Radio contact was then lost. None of the planes or crew were ever seen again. The official explanation is that before they vanished, the planes ____ into an area of unusual magnetic activity. It is believed that this ____ their equipment to stop working. The planes were flying over the Atlantic Ocean near Bermuda and the story of the Bermuda Triangle was born. By the mid-1970s, 16 more planes ____ in the same area. And it appears that in almost all cases, the equipment ____ working just before the planes disappeared.

Past Perfect Simple or Continuous?

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